From Xinglong Observatory [兴隆观测站] (CN): “LAMOST Releases Its Updated Seventh Data to Astronomers Worldwide” 

LAMOST telescope located in Xinglong Station, Hebei Province, China, Altitude 960 m (3,150 ft).

From Xinglong Observatory [兴隆观测站] (CN)

Chinese Academy of Sciences [中国科学院] (CN)

Oct 21, 2021

XU Ang
The National Astronomical Observatories of China [ 国家天文台] at Chinese Academy of Sciences [中国科学院](CN)
annxu@nao.cas.cn

LAMOST published its updated Seventh Data Release (DR7 v2.0) to astronomers worldwide on Sept. 30, 2021. DR7 v2.0 covers the spectra obtained from the pilot survey through the seven-year regular survey from October 2011 to June 2019.

1
Footprint of the LAMOST pilot survey and the seven-year regular low-resolution survey (top); Footprint of the LAMOST medium-resolution commissioning and the first-year regular medium-resolution survey (bottom). Image by LAMOST.

Obtained from the low-resolution observation of 4,922 plates and medium-resolution observation of 679 plates, a total of 14.23 million spectra are released in the DR7 v2.0, including 10.43 million low-resolution spectra, 0.98 million medium-resolution non-time-domain spectra and 2.82 million medium-resolution time-domain spectra. The number of high-quality spectra reaches 11.35 million.

Moreover, a stellar spectral parameter catalogue of 6.91 million stars is also released this time, which is currently the largest stellar spectral parameter catalogue in the world. The dataset is accessible at http://dr7.lamost.org.

After the DR7 v1.0 was released to domestic astronomers and international partners in March 2020, the Data Processing Department of LAMOST Operation and Development Center has updated and optimized the DR7 dataset twice using the upgraded data processing software, and the corresponding datasets of DR7 v1.2 and DR7 v1.3 have been released, successively.

On this basis, the DR7 v2.0 dataset released this time has been further updated. The catalogues of confirmed cataclysmic variable stars, white dwarf stars and sub-dwarf stars were added, and the temperature range of stellar parameters was expanded to 8,500K-18,000K.

The spectral data and related products of LAMOST provide valuable insights for the study of the Galactic structure, origin and evolution, stellar physics, special and compact celestial objects, quasars, and so on.

See the full article here .

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Chinese Academy of Sciences-National Astronomical Observatories Xinglong Observatory Station, located in Xinglong Station, Hebei Province, China.

The Xinglong Observatory [兴隆观测站] (CN) of the National Astronomical Observatories, Chinese Academy of Sciences (NAOC) (IAU code: 327, coordinates: 40°23′39′′ N, 117°34′30′′ E) was founded in 1968. At present, it is one of most primary observing stations of NAOC. As the largest optical astronomical observatory site in the continent of Asia, it has 9 telescopes with effective aperture larger than 50 cm. These are the Guo Shoujing Telescope, also called the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST), the 2.16-m Telescope, a 1.26-m optical & near-infrared telescope, a 1-m Alt-Az telescope, an 85-cm telescope (NAOC-Beijing Normal University [北京師範大學](CN) Telescope, NBT), an 80-cm telescope (Tsinghua University [清华大学](CN)-NAOC Telescope, TNT), a 60-cm telescope, a 50-cm telescope and a 60/90-cm Schmidt telescope.
The average altitude of the Xinglong Observatory is about 900 m. The Xinglong Observatory is located at the south of the main peak of the Yanshan Mountains, in the Xinglong County, Hebei Province, which lies about 120 km (about 2 hours’ drive) to the northeast of Beijing. A shuttle bus runs between NAOC campus and Xinglong Observatory every Tuesday and Friday. The mean and media seeing values of the Xinglong Observatory are 1.9′′ and 1.7′′, respectively. On average, there are 117 photometric nights and 230 observable nights per year based on the data of 2007-2014. Most of the time, the wind speed is less than 4 m/s (the mean value is 2 m/s), and the sky brightness is about 21.1 mag arcsec2 in V band at the zenith.

Each year, more than a hundred astronomers use the telescopes of the Xinglong Observatory to perform the observations for the studies on Galactic sciences (stellar parameters, extinction measurements, Galactic structures, exoplanets, etc.) and extragalactic sciences (including nearby galaxies, AGNs, high-redshift quasars), as well as time-domain astronomy (supernovae, gamma-ray bursts, stellar tidal disruption events, and different types of variable stars). In recent years, besides the basic daily maintenance of the telescopes, new techniques and methods have been explored by the engineers and technicians of the Xinglong Observatory to improve the efficiency of observations. Meanwhile, the Xinglong Observatory is also a National populscience and education base of China for training students from graduate schools, colleges, high schools and other education institutes throughout China, and it has hosted a number of international workshops and summer schools.

The Chinese Academy of Sciences [中国科学院] (CN) is the linchpin of China’s drive to explore and harness high technology and the natural sciences for the benefit of China and the world. Comprising a comprehensive research and development network, a merit-based learned society and a system of higher education, CAS brings together scientists and engineers from China and around the world to address both theoretical and applied problems using world-class scientific and management approaches.

Since its founding, CAS has fulfilled multiple roles — as a national team and a locomotive driving national technological innovation, a pioneer in supporting nationwide S&T development, a think tank delivering S&T advice and a community for training young S&T talent.

Now, as it responds to a nationwide call to put innovation at the heart of China’s development, CAS has further defined its development strategy by emphasizing greater reliance on democratic management, openness and talent in the promotion of innovative research. With the adoption of its Innovation 2020 programme in 2011, the academy has committed to delivering breakthrough science and technology, higher caliber talent and superior scientific advice. As part of the programme, CAS has also requested that each of its institutes define its “strategic niche” — based on an overall analysis of the scientific progress and trends in their own fields both in China and abroad — in order to deploy resources more efficiently and innovate more collectively.

As it builds on its proud record, CAS aims for a bright future as one of the world’s top S&T research and development organizations.